JP2785028B2 - Plasma ashing device - Google Patents

Plasma ashing device

Info

Publication number
JP2785028B2
JP2785028B2 JP1002045A JP204589A JP2785028B2 JP 2785028 B2 JP2785028 B2 JP 2785028B2 JP 1002045 A JP1002045 A JP 1002045A JP 204589 A JP204589 A JP 204589A JP 2785028 B2 JP2785028 B2 JP 2785028B2
Authority
JP
Japan
Prior art keywords
substrate
reactive gas
processing chamber
vacuum processing
plasma
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP1002045A
Other languages
Japanese (ja)
Other versions
JPH02183526A (en
Inventor
正志 菊池
俊成 高田
篤雄 渡部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ulvac Inc
Original Assignee
Nihon Shinku Gijutsu KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nihon Shinku Gijutsu KK filed Critical Nihon Shinku Gijutsu KK
Priority to JP1002045A priority Critical patent/JP2785028B2/en
Priority to US07/462,380 priority patent/US5226056A/en
Publication of JPH02183526A publication Critical patent/JPH02183526A/en
Application granted granted Critical
Publication of JP2785028B2 publication Critical patent/JP2785028B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Drying Of Semiconductors (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、半導体の基板に塗布されたフォトレジスト
膜を、プラズマを利用してアッシング(灰化)すること
により除去するプラズマアッシング装置に関する。
Description: TECHNICAL FIELD The present invention relates to a plasma ashing apparatus for removing a photoresist film applied to a semiconductor substrate by ashing (ashing) using plasma.

(従来の技術) 微細な集積回路を加工するために、半導体の基板の表
面に回路パターンを形成したフォトレジスト膜を設け、
該レジスト膜を介してその下層の絶縁膜、半導体膜或は
金属膜をエッチングすることが行なわれている。
(Prior Art) In order to process a fine integrated circuit, a photoresist film having a circuit pattern formed on a surface of a semiconductor substrate is provided.
The underlying insulating film, semiconductor film or metal film is etched through the resist film.

該レジスト膜は、エッチング処理が終了したのち基板
表面から除去されるが、その除去方法には過酸化水素、
有機溶剤などの化学薬品を使用する湿式処理方法と、酸
素を主成分とする反応性ガスのプラズマを用いてレジス
トをアッシング(灰化)する乾式処理方法とがある。該
湿式処理方法に使用される薬品には人体に有害なものが
多く、除去作業の安全性の維持や廃液の公害防止に注意
を払う必要があって煩らわしい。しかも、使用される薬
品には多少の不純物を含むので、これが半導体回路のパ
ターンの欠損や基板の汚染の原因となり、超LSI等の微
細な加工には適しない。該乾式処理方法は、例えば基板
の塗布されたCxHyNzのレジスト膜に、反応性ガスのプラ
ズマ中に生じた酸素ラジカルを反応させ、該レジスト膜
をCO2及びH2Oへ分解し気化することによって除去するの
で、湿式処理方法のような人体への有害物の発生がな
く、不純物を含まないので基板の微細加工に適してい
る。
The resist film is removed from the substrate surface after the etching process is completed, and the removal method includes hydrogen peroxide,
There are a wet processing method using a chemical such as an organic solvent, and a dry processing method in which the resist is ashed (ashed) using a plasma of a reactive gas containing oxygen as a main component. Many of the chemicals used in the wet treatment method are harmful to the human body, and it is troublesome to pay attention to maintaining the safety of the removal operation and preventing the pollution of the waste liquid. In addition, since the used chemicals contain some impurities, they cause the pattern of the semiconductor circuit to be lost and the substrate to be contaminated, and are not suitable for fine processing such as ultra LSI. The dry treatment method is, for example, by reacting a CxHyNz resist film coated on a substrate with oxygen radicals generated in a plasma of a reactive gas, and decomposing and evaporating the resist film into CO 2 and H 2 O. Since it is removed, there is no generation of harmful substances to the human body as in a wet processing method, and it is suitable for fine processing of a substrate because it does not contain impurities.

該乾式処理方法に使用されている装置の具体例は第1
図示の如くであり、レジスト膜を表面に塗布した基板
(1)を真空処理室(2)内に設けた加熱手段(3)の
上に置き、該真空処理室(2)の一方の側壁に、反応性
ガス源(4)からの反応性ガスが流通し且つ途中に該反
応性ガスのプラズマを発生させるマイクロ波放電管から
なるプラズマ発生装置(5)を備えた反応性ガス導入管
(6)を接続し、該真空処理室(2)の他方の側壁に、
真空ポンプ(7)に接続された真空排気管(8)を接続
して構成される。これに於ては、反応性ガス導入管
(6)を流通する酸素ガス或はこれに少量のCF4、N2
しくはH2を混入した反応性ガスが、プラズマ発生装置
(5)によりプラズマ化され、酸素ラジカルその他の反
応性ガスのラジカルが加熱された基板(1)上のレジス
ト膜と反応し、レジスト膜は分解、気化されて真空排気
管(8)から排除される。
Specific examples of the apparatus used in the dry processing method are described in
As shown in the drawing, a substrate (1) coated with a resist film on its surface is placed on a heating means (3) provided in a vacuum processing chamber (2), and is placed on one side wall of the vacuum processing chamber (2). A reactive gas introduction pipe (6) provided with a plasma generator (5) including a microwave discharge tube through which a reactive gas from the reactive gas source (4) flows and generates a plasma of the reactive gas in the middle. ), And on the other side wall of the vacuum processing chamber (2),
It is configured by connecting a vacuum exhaust pipe (8) connected to a vacuum pump (7). In this case, the oxygen gas flowing through the reactive gas introducing pipe (6) or the reactive gas mixed with a small amount of CF 4 , N 2 or H 2 is turned into plasma by the plasma generator (5). Then, oxygen radicals and other reactive gas radicals react with the heated resist film on the substrate (1), and the resist film is decomposed and vaporized and removed from the vacuum exhaust pipe (8).

(発明が解決しようとする課題) 前記第1図示の装置は、反応性ガスのダウンストリー
ムが基板の表面に沿ってその一端側から他端側へと流
れ、レジスト膜がアッシングされるが、そのアッシング
速度の分布は第2図の曲線Aに見られるように、反応性
ガスの流れの上流側のレジスト膜のアッシング速度がそ
の下流側よりも極めて遅く、アッシングを完了するまで
時間が掛る欠点がある。
(Problem to be Solved by the Invention) In the apparatus shown in the first illustration, the downstream of the reactive gas flows from one end to the other end along the surface of the substrate, and the resist film is ashed. As can be seen from the distribution of the ashing speed as shown by the curve A in FIG. 2, the ashing speed of the resist film on the upstream side of the reactive gas flow is much lower than that on the downstream side, and it takes time to complete the ashing. is there.

本発明は、アッシングが速度を均一化することによっ
てアッシングの完了までに要する時間を短縮することが
できるプラズマアッシング装置を提供することを目的と
するものである。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasma ashing apparatus capable of reducing the time required for completing ashing by making the ashing speed uniform.

(課題を解決するための手段) 本発明では、フォトレジスト膜を表面に塗布した基板
を設置した真空処理室内に、該基板を加熱する加熱手段
を設け、該真空処理室に、反応性ガスが流通し且つ途中
に該反応性ガスのプラズマを発生させるプラズマ発生装
置を備えた反応性ガス導入管と、真空ポンプに接続され
た真空排気管とを接続し、該反応性ガス導入管から導入
される励起された状態の反応性ガスを加熱された基板の
表面に沿って流し、該表面の該レジスト膜をアッシング
するようにしたものに於て、該真空処理室内を該基板の
表面に沿って設けた全面に小孔を有する多孔板からなる
シャワープレートで2室に区画し、該シャワープレート
の該基板の表面の中央部に対向する位置に大径の孔を形
成し、該基板が存する側に該真空排気管を接続し、もう
一方の室に反応性ガス導入管を接続することにより、前
記目的を達成するようにした。
(Means for Solving the Problems) In the present invention, a heating means for heating a substrate provided with a substrate coated with a photoresist film on the surface is provided in the vacuum processing chamber, and a reactive gas is supplied to the vacuum processing chamber. A reactive gas introduction pipe having a plasma generator that circulates and generates a plasma of the reactive gas in the middle is connected to a vacuum exhaust pipe connected to a vacuum pump, and is introduced from the reactive gas introduction pipe. The excited reactive gas is caused to flow along the surface of the heated substrate, and the resist film on the surface is ashed. In the vacuum processing chamber, the reactive gas flows along the surface of the substrate. A shower plate made of a perforated plate having small holes on the entire surface is divided into two chambers, and a large-diameter hole is formed at a position facing the center of the surface of the substrate of the shower plate, and the side where the substrate exists is formed. To the vacuum exhaust pipe. Subsequently, the above purpose was achieved by connecting a reactive gas introduction pipe to the other chamber.

(作用) 表面にレジスト膜を塗布した基板を真空処理室内に置
き、真空処理室内を真空に排気したのち基板を加熱手段
により加熱し、該基板が所定の温度になると、反応性ガ
ス導入管から反応性ガスを導入する。該反応性ガス導入
管の途中に設けられたプラズマ発生装置により導入され
る反応性ガスはプラズマ化され、励起した状態で真空処
理室内に導入される。該反応性ガスの主としてラジカル
成分が基板のレジスト膜に接触すると、該レジスト膜の
成分と化合し、該レジスト膜は分解され、気化して真空
排気管へと運ばれ、基板の表面から取除かれる。
(Operation) A substrate having a resist film coated on its surface is placed in a vacuum processing chamber, and the vacuum processing chamber is evacuated to a vacuum. Then, the substrate is heated by a heating means. A reactive gas is introduced. The reactive gas introduced by the plasma generator provided in the middle of the reactive gas introduction pipe is turned into plasma and is introduced into the vacuum processing chamber in an excited state. When mainly the radical component of the reactive gas comes into contact with the resist film on the substrate, it combines with the components of the resist film, and the resist film is decomposed, vaporized and carried to the vacuum exhaust pipe, and removed from the surface of the substrate. I will

こうした作用は従来のプラズマアッシング装置と同様
であるが、、本発明の装置に於ては、該基板の表面の前
方に、中心に大口径孔を備えその周囲に小孔を形成した
多孔板からなるシャワープレートを設けて真空処理室内
を2室に区画し、基板が存する側の室に真空排気管を設
け、もう一方の室に反応性ガス導入管を設ける構成を有
するので、真空処理室内に導入された反応性ガスは、シ
ャワープレートの多数の孔を介してレジスト膜の全面に
一斉にシャワー状に当り、レジスト膜は各所に於て反応
性ガスのラジカルとの接触で分解、気化され、速いアッ
シング速度でしかも均一に除去することが出来、該多孔
板の中心に大口径の孔を形成することにより良好な均一
性でアッシングを行なえる。
Such an action is similar to that of a conventional plasma ashing apparatus, but in the apparatus of the present invention, a large-diameter hole is provided at the center in front of the surface of the substrate, and a perforated plate having a small hole formed around the hole. The vacuum processing chamber is divided into two chambers by providing a shower plate, and a vacuum exhaust pipe is provided in the chamber where the substrate exists, and a reactive gas introduction pipe is provided in the other chamber. The introduced reactive gas hits the entire surface of the resist film in a shower at once through a number of holes in the shower plate, and the resist film is decomposed and vaporized in various places by contact with radicals of the reactive gas, The ashing can be uniformly removed at a high ashing speed, and ashing can be performed with good uniformity by forming a large-diameter hole in the center of the perforated plate.

(実施例) 本発明の実施例を図面第3図に基づき説明する。同図
に於て符号(1)乃至(8)は第1図の同一符号で示し
たものと同一のものを指称し、基板(1)の表面には、
一般的なCxHyNzの組成を有するフォトレジスト膜(9)
が第4図示のように塗布されているものとする。
Example An example of the present invention will be described with reference to FIG. In the figure, reference numerals (1) to (8) denote the same components as those shown by the same reference numerals in FIG. 1, and the surface of the substrate (1)
Photoresist film with general CxHyNz composition (9)
Is applied as shown in FIG.

第3図示の本発明の実施例は、フォトレジスト膜
(9)を塗布した基板(1)の表面と間隔(10)を存し
て該表面に沿ったアルミニウム製の多孔板からなるシャ
ワープレート(11)を設けて真空処理室(2)の内部を
2室(12)(13)に区画するようにした。そして該基板
(1)が存在する方の室(12)に真空排気管(8)を接
続し、もう一方の室(13)に反応性ガス導入管(6)を
接続する。該反応性ガス導入管(6)は基板(1)の背
面に対向する位置に開口するように設けられ、真空排気
管(8)は基板(1)の表面に対して斜め上方の真空処
理室(2)の周壁に設けるようにした。
In the embodiment of the present invention shown in FIG. 3, a shower plate (aperture plate made of aluminum) is formed along the surface of the substrate (1) on which the photoresist film (9) is applied, at a distance (10) along the surface. 11) is provided to divide the inside of the vacuum processing chamber (2) into two chambers (12) and (13). Then, a vacuum exhaust pipe (8) is connected to the chamber (12) where the substrate (1) is present, and a reactive gas introduction pipe (6) is connected to the other chamber (13). The reactive gas introduction pipe (6) is provided so as to open at a position facing the back surface of the substrate (1), and the vacuum exhaust pipe (8) is provided in a vacuum processing chamber obliquely above the surface of the substrate (1). It is provided on the peripheral wall of (2).

該シャワープレート(11)は、直径17cmの円板形の形
状を有し、直径5インチの円形の基板(1)の表面の中
央部に対向する個所に直径28mmの大径の孔(14)が開孔
され、残りの個所に直径1mmの小径の孔(15)をほぼ等
間隔で1000個形成した。該シャワープレート(11)と基
板(1)の表面との間隔(10)は例えば7mmに設定され
る。
The shower plate (11) has a disk shape with a diameter of 17 cm and a large-diameter hole (14) having a diameter of 28 mm at a position facing the center of the surface of a circular substrate (1) having a diameter of 5 inches. Was opened, and 1,000 small-diameter holes (15) having a diameter of 1 mm were formed at substantially the same intervals in the remaining portions. The distance (10) between the shower plate (11) and the surface of the substrate (1) is set to, for example, 7 mm.

反応性ガスとしては、酸素を主体としたガスが使用さ
れ、5slmの酸素ガスと、300SCCMの窒素又は水素ガスと
を混合して反応性ガス導入管(6)に供給し、その途中
に於て、750Wのマイクロ波電力が印加されたプラズマ発
生装置(5)により該反応性ガスがプラズマ化されるよ
うにした。
As the reactive gas, a gas mainly composed of oxygen is used. A mixture of 5 slm oxygen gas and 300 SCCM nitrogen or hydrogen gas is supplied to the reactive gas introduction pipe (6), and in the middle of the mixture, The reactive gas was turned into plasma by a plasma generator (5) to which microwave power of 750 W was applied.

基板(1)はホットプレート形の加熱手段(3)によ
り例えば200℃に加熱され、これによってレジスト膜
(9)が化学反応を生じ易い温度に加熱される。第3図
の符号(16)は真空処理室(2)に設けた赤外線温度計
で、該温度計(16)はシャワープレート(11)の大径の
孔(14)及びCaF2製の窓(17)を介して基板(1)の温
度を測定する。
The substrate (1) is heated to, for example, 200 ° C. by a hot plate type heating means (3), whereby the resist film (9) is heated to a temperature at which a chemical reaction easily occurs. Reference numeral (16) in FIG. 3 denotes an infrared thermometer provided in the vacuum processing chamber (2). The thermometer (16) has a large-diameter hole (14) of the shower plate (11) and a window made of CaF 2 ( Measure the temperature of the substrate (1) via 17).

その作動を説明するに、レジスト膜(9)が塗布され
た基板(1)を真空処理室(2)内の加熱手段(3)の
上に載せ、真空処理室(2)内を真空排気管(8)から
の排気により真空化し、基板(1)を加熱手段(3)に
より200℃に加熱する。次いで酸素ガスと水素ガスの混
合ガスを反応性ガス導入管(6)から真空処理室(2)
内へ、圧力が2Torrになるように制御し乍ら導入し、プ
ラズマ発生装置(5)を作動させて反応性ガスにプラズ
マを生じさせると、ラジカル成分の多い反応性ガスがシ
ャワープレート(11)の大径の孔(14)及び小径の孔
(15)を介して基板(1)の表面にシャワー状に当り、
加熱されたレジスト膜(9)とその全面に於て化学反応
する。この反応によりレジスト膜(9)はCO2、H2Oに分
解されて気化し、真空排気管(8)から排除され、基板
(1)の表面から除去される。
To explain the operation, the substrate (1) coated with the resist film (9) is placed on the heating means (3) in the vacuum processing chamber (2), and the inside of the vacuum processing chamber (2) is evacuated. Vacuum is created by the evacuation from (8), and the substrate (1) is heated to 200 ° C. by the heating means (3). Next, a mixed gas of oxygen gas and hydrogen gas is supplied from the reactive gas introduction pipe (6) to the vacuum processing chamber (2).
The plasma is introduced into the reactor while controlling the pressure to 2 Torr, and the plasma is generated in the reactive gas by operating the plasma generator (5). Hits the surface of the substrate (1) in a shower through the large-diameter hole (14) and the small-diameter hole (15),
A chemical reaction occurs on the entire surface of the heated resist film (9). By this reaction, the resist film (9) is decomposed into CO 2 and H 2 O and vaporized, removed from the vacuum exhaust pipe (8), and removed from the surface of the substrate (1).

基板(1)の表面の前方に設けたシャワープレート
(11)は多数の小孔(15)が形成されているので基板
(1)の表面全体に反応性ガスが当り、該表面の中央部
に対向した大径の孔(14)が形成されているので該表面
の中央部から周辺部へと反応性ガスを誘導することが出
来、速いアッシング速度で均一にレジスト膜(9)が除
去される。基板(1)が直径5インチの場合、アッシン
グ速度は2.74μm/min、均一性は±5.3%であった。
Since the shower plate (11) provided in front of the surface of the substrate (1) has a large number of small holes (15), the reactive gas hits the entire surface of the substrate (1), Since opposed large holes (14) are formed, a reactive gas can be guided from the center to the periphery of the surface, and the resist film (9) is uniformly removed at a high ashing speed. . When the substrate (1) had a diameter of 5 inches, the ashing speed was 2.74 μm / min and the uniformity was ± 5.3%.

本発明の更に具体的な実施例を、図面第5図乃至第7
図に基づき説明すると、これらの図面に於て符号(18)
は枠状の機体を示し、該機体(18)の上方に真空処理室
(2)が取付けられる。該真空処理室(2)の側方には
プラズマ発生装置(5)が設けられ、該プラズマ発生装
置(5)の内部を通って該真空処理室(2)内へと反応
性ガス源(4)から連通する反応性ガス導入管(6)が
設けられる。更に、該真空処理室(2)の側方でプラズ
マ発生装置(5)から約90°旋回した位置に、バルブ
(19)を介して該真空処理内(2)内へ基板(1)を搬
出入するトランスファー室(20)が設けられ、該トラン
スファー室(20)には更にカセット室(21)が連続して
設けられる。該カセット室(21)内にはその外部から導
入した2組の昇降杆(22)により夫々個別に昇降される
2台のテーブルが設けられ、各テーブル上に側方から出
し入れ自在に複数枚の基板を収容する第8図示のような
棚状のカセットケース(23a)(23b)が載せられる。
A more specific embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to the drawings.
Denotes a frame-shaped body, and a vacuum processing chamber (2) is mounted above the body (18). A plasma generator (5) is provided on the side of the vacuum processing chamber (2), and a reactive gas source (4) passes through the inside of the plasma generator (5) and into the vacuum processing chamber (2). ) Is provided with a reactive gas introduction pipe (6). Further, the substrate (1) is unloaded into the vacuum processing chamber (2) via the valve (19) at a position turned about 90 ° from the plasma generator (5) beside the vacuum processing chamber (2). A transfer chamber (20) is provided therein, and a cassette chamber (21) is further provided in the transfer chamber (20). In the cassette chamber (21), there are provided two tables which are individually raised and lowered by two sets of lifting rods (22) introduced from the outside. A shelf-like cassette case (23a) (23b) as shown in FIG.

一方のカセットケース(23a)にはアッシングされる
基板が収められ、該基板にテーブルの下降と該トランス
ファー室(20)内に設けた例えば第9図示のようなフロ
ッグアーム状の搬送装置(24)によって、該カセットケ
ース(23a)の下段のものからバルブ(19)を介して真
空処理室(2)内の定位置に送られる。真空処理室
(2)内に於て、該基板にアッシング処理を施す間、該
バルブ(19)は閉じられ、搬送装置(24)はトランスフ
ァー室(20)内で待機する。アッシング処理が終ると、
再び搬送装置(24)が開かれたバルブ(19)を介して真
空処理室(2)内へ進出し、アッシング処理された基板
を載せてトランスファー室(20)内へ戻り、該搬送装置
(24)上の基板は他のカセットケース(23b)内へ該搬
送装置(24)の旋回と伸長により運び込まれ、該カセッ
トケース(23b)の上昇により所定の位置に収容され
る。処理済みの基板が他のカセットケース(23b)に収
められると、もう一方のカセットケース(23a)から次
の基板を真空処理室(2)へと運び出すことを繰返して
順次に基板のアッシング処理が行なわれる。
The substrate to be ashed is stored in one of the cassette cases (23a), the table is lowered on the substrate, and a transfer device (24) in the form of, for example, a frog arm as shown in FIG. 9 provided in the transfer chamber (20) Is sent from the lower part of the cassette case (23a) to a fixed position in the vacuum processing chamber (2) via the valve (19). In the vacuum processing chamber (2), while performing the ashing process on the substrate, the valve (19) is closed, and the transfer device (24) stands by in the transfer chamber (20). After the ashing process,
Again, the transfer device (24) advances into the vacuum processing chamber (2) via the opened valve (19), places the substrate subjected to the ashing processing, returns to the transfer chamber (20), and returns to the transfer device (24). The upper substrate is carried into another cassette case (23b) by turning and extending the transfer device (24), and is stored in a predetermined position by raising the cassette case (23b). When the processed substrate is stored in another cassette case (23b), the next substrate is transported from the other cassette case (23a) to the vacuum processing chamber (2), and the substrate ashing process is sequentially performed. Done.

該真空処理室(2)の下方にスロットルバルブ(25)
を備えた真空排気管(8)が接続され、該真空処理室
(2)内を真空ポンプ(7)で真空に排気するが、該真
空排気管(8)の途中を分岐してカセット室(21)に接
続し、該カセット室(21)内も真空に排気されるように
した。
A throttle valve (25) is provided below the vacuum processing chamber (2).
Is connected to the vacuum processing chamber (2), and the inside of the vacuum processing chamber (2) is evacuated to a vacuum by a vacuum pump (7). 21), and the inside of the cassette chamber (21) was evacuated to a vacuum.

第5図及び第6図に於て、符号(26)はマイクロ波発
振装置を示し、これにより発生したマイクロ波が導波管
(27)を介してプラズマ発生装置(5)に導入される。
In FIGS. 5 and 6, reference numeral (26) denotes a microwave oscillating device, and the generated microwave is introduced into the plasma generating device (5) via the waveguide (27).

該プラズマ発生装置(5)の詳細は、第10図及び第11
図示の如くであり、反応性ガス源(4)に連らなる反応
性ガス導入管(6)の中間部の石英製チューブ(6a)と
交叉するように前記導波管(27)が設けられ、該交叉部
に於て反応性ガスがマイクロ波により励起されてプラズ
マを発生し、励起された反応性元素のラジカルが真空処
理室(2)に送り込まれる。該プラズマ発生装置(5)
のケーシング(5a)には、冷却水が循環する通路(28)
が設けられてプラズマ放電によるケーシングの高温化を
防止するようにした。該ケーシング(5a)の石英製チュ
ーブ(6a)の端部と対向する位置に、石英窓(29)を介
して水銀ランプ(30)を設け、プラズマ放電の開始時に
該水銀ランプ(30)を点灯して石英製チューブ(6a)内
の反応性ガスの光イオン化を行ない、マイクロ波放電の
開始を迅速に行なえるようにした。またマイクロ波の導
波管(27)内の端部に、該ケーシング(5a)を介して外
部へ延びる調節ねじ(31)の旋回により進退するスライ
ドブロック(32)を設け、その進退によりプラズマ放電
のマッチングを行なうようにした。
Details of the plasma generator (5) are shown in FIGS.
As shown in the drawing, the waveguide (27) is provided so as to cross a quartz tube (6a) at an intermediate portion of a reactive gas introduction pipe (6) connected to a reactive gas source (4). At the intersection, the reactive gas is excited by the microwave to generate plasma, and the radicals of the excited reactive element are sent to the vacuum processing chamber (2). The plasma generator (5)
The casing (5a) has a passage (28) through which cooling water circulates.
Is provided to prevent the casing from becoming hot due to plasma discharge. A mercury lamp (30) is provided in the casing (5a) at a position facing the end of the quartz tube (6a) via a quartz window (29), and the mercury lamp (30) is turned on at the start of plasma discharge. Then, the reactive gas in the quartz tube (6a) was photoionized so that the microwave discharge could be started quickly. Further, a slide block (32) is provided at the end of the microwave waveguide (27) inside the waveguide (27), which moves forward and backward by turning an adjustment screw (31) extending through the casing (5a). To perform matching.

真空処理室(2)内の詳細は、第12図に示す如くであ
り、上下方向の円筒形の空室で形成され、その側部上方
に、基板(1)をトランスファー室(20)との間で出し
入れするための開口(33)と、該開口(33)から90°旋
回した位置に反応性ガス導入管(6)の端部とが開口形
成される。そして、該真空処理室(2)の開口(33)よ
りも少し下方に、複数本のポリテトラフルオロエチレン
製の絶縁材のサポート(34)により該真空処理室(2)
の底面に支えられた円形状の凹部(35a)を有するAl2O3
製のホルダ(35)を設け、該凹部(35a)内に外部の電
源からの通電により発熱する円板状のシーズ形ヒータか
らなる加熱手段(3)を収めるようにした。該加熱手段
(3)の上面はAl2O3製の絶縁板(36)で覆われ、該加
熱手段(3)の上面の周縁はSiO2製のリング(37)で覆
われるようにした。また円板状の加熱手段(3)及びホ
ルダ(35)にこれらを上下に挿通する透孔(38)を120
°の間隔を存して3個設け、該ホルダ(35)の背後から
昇降装置(39)により上下に移動する3本の石英製のピ
ン(40)が前記各透孔(38)に夫々挿通される。そして
真空処理室(2)内へ開口(33)を介して搬送装置(2
4)によって基板(1)が搬入されると、加熱手段
(3)を挿通して上昇する各ピン(40)で該搬送装置
(24)から持ち上げるようにして支え、該搬送装置(2
4)が該開口(33)から退去したのち各ピン(40)が降
下して加熱手段(3)の上面へ基板(1)を載せ、アッ
シングのために該基板(1)が加熱される。該基板
(1)のアッシングを終ると、各ピン(40)により再び
加熱手段(3)の上方へ基板(1)が持ち上げられ、該
加熱手段(3)と基板(1)との間に搬送装置(24)が
進入すると、各ピン(40)が降下し、その降下途中に於
て基板(1)は搬送装置(24)に保持され、真空処理室
(2)の開口(33)からトランスファー室(20)へ運び
出される。
Details of the inside of the vacuum processing chamber (2) are as shown in FIG. 12, which is formed by a vertical cylindrical empty chamber, and the substrate (1) is connected to the transfer chamber (20) above its side. An opening (33) for taking in and out the space and an end of the reactive gas introduction pipe (6) are formed at a position turned by 90 ° from the opening (33). Then, slightly below the opening (33) of the vacuum processing chamber (2), the vacuum processing chamber (2) is supported by a plurality of polytetrafluoroethylene insulating material supports (34).
Al 2 O 3 with a circular recess (35a) supported on the bottom surface of
A holder (35) made of an aluminum alloy is provided, and a heating means (3) composed of a disk-shaped sheathed heater that generates heat when energized from an external power supply is accommodated in the recess (35a). The upper surface of the heating means (3) was covered with an insulating plate (36) made of Al 2 O 3 , and the periphery of the upper surface of the heating means (3) was covered with a ring (37) made of SiO 2 . Also, a through hole (38) for vertically inserting these into the disk-shaped heating means (3) and the holder (35) is provided.
And three quartz pins (40), which are moved up and down by a lifting device (39) from behind the holder (35), are inserted into the through holes (38), respectively. Is done. Then, the transfer device (2) is introduced into the vacuum processing chamber (2) through the opening (33).
When the substrate (1) is carried in by the method (4), the pins (40), which are inserted through the heating means (3) and lifted from the transfer device (24), are supported by the pins (40).
After 4) has retreated from the opening (33), the pins (40) descend and the substrate (1) is placed on the upper surface of the heating means (3), and the substrate (1) is heated for ashing. After the ashing of the substrate (1) is completed, the substrate (1) is lifted again above the heating means (3) by the pins (40) and transported between the heating means (3) and the substrate (1). When the device (24) enters, each pin (40) descends, and during the descent, the substrate (1) is held by the transfer device (24) and transferred from the opening (33) of the vacuum processing chamber (2). It is carried out to room (20).

該昇降装置(39)は、真空処理室(2)の底面からそ
の外部へとシール装置(41)を介して延びる昇降杆(39
a)と、該昇降杆(39a)の上端に取付けられた昇降プレ
ート(39b)と、該昇降杆(39a)の下端に取付けられた
連結プレート(39c)、及び該連結プレート(39c)に螺
合するねじ軸(39d)を備えており、該真空処理室
(2)の外部の固定のプレート(42)に取付けたシンク
ロナスモータ(43)の回転がその出力軸(44)及びアイ
ドル歯車(45)を介してプレート(42)に支承されたね
じ軸(39d)と一体に歯車(39e)に伝達されると、該ね
じ軸(39d)が回転し、連結プレート(39c)及び昇降杆
(39a)を上昇或は下降させ、これに伴なって昇降プレ
ート(39c)がピン(40)と共に昇降する。該ピン(4
0)はその根部を昇降プレート(39c)の穴(39f)に挿
通させ、ばね(39g)により固定した。
The lifting device (39) is a lifting rod (39) extending from the bottom surface of the vacuum processing chamber (2) to the outside thereof via a sealing device (41).
a), an elevating plate (39b) attached to the upper end of the elevating rod (39a), a connecting plate (39c) attached to the lower end of the elevating rod (39a), and a screw attached to the connecting plate (39c). And a synchronous shaft (39d) mounted on a fixed plate (42) outside the vacuum processing chamber (2). The rotation of the synchronous motor (43) is controlled by the output shaft (44) and the idle gear (44). When transmitted to the gear (39e) integrally with the screw shaft (39d) supported on the plate (42) via the plate (42), the screw shaft (39d) rotates, and the connecting plate (39c) and the elevating rod ( 39a) is raised or lowered, and the lifting plate (39c) moves up and down together with the pins (40) accordingly. The pin (4
In (0), the root was inserted through the hole (39f) of the elevating plate (39c), and was fixed with a spring (39g).

真空処理室(2)内の開口(33)とガス導入管(6)
の開口端との間に位置して、内方に突出する段部(46)
が設けられ、該段部(46)に、中央部に大径の孔(14)
が有し且つその周囲に小径の孔(15)を有するシャワー
プレート(11)を載せ、該真空処理室(2)内が該シャ
ワープレート(11)により2室(12)(13)に区画され
るようにした。
Opening (33) in vacuum processing chamber (2) and gas inlet pipe (6)
Inwardly protruding step (46) located between the open ends of the
The step (46) is provided with a large-diameter hole (14) in the center.
And a shower plate (11) having a small-diameter hole (15) is placed around the shower plate, and the inside of the vacuum processing chamber (2) is partitioned into two chambers (12) and (13) by the shower plate (11). It was to so.

(発明の効果) 以上のように、本発明によるときは、レジスト膜が塗
布された基板の表面に沿って多孔板、好ましくは中心に
大口径の孔を有する多孔板のシャワープレートを設ける
ことにより真空処理室内を2室に区画し、基板が設けら
れる側の室に真空排気管を設け、もう一方の室に反応性
ガス導入管を設けるようにしたので、反応性ガスは基板
の表面全体に均一に当り、速いアッシング速度で均一に
レジスト膜のプラズマアッシングを行なえる等の効果が
ある。
(Effect of the Invention) As described above, according to the present invention, a perforated plate, preferably a perforated plate having a large-diameter hole in the center, is provided along the surface of the substrate coated with the resist film, thereby providing a shower plate. The vacuum processing chamber is divided into two chambers, a vacuum exhaust pipe is provided in the chamber on which the substrate is provided, and a reactive gas introduction pipe is provided in the other chamber, so that the reactive gas is spread over the entire surface of the substrate. The uniformity of the resist film makes it possible to uniformly perform the plasma ashing of the resist film at a high ashing speed.

【図面の簡単な説明】[Brief description of the drawings]

第1図は従来のプラズマアッシング装置の断面図、第2
図は第1図示の装置によるアッシング速度の分布を示す
線図、第3図は本発明装置の実施例の断面図、第4図は
基板の拡大断面図を示す。また、第5図乃至第12図は本
発明の具体的実施例を示し、第5図は本発明の装置の一
部を截断した側面図、第6図は第5図のVI-VI線に沿っ
た截断側面図、第7図は第5図のVII-VII線に沿った截
断平面図、第8図はカセットケースの斜視図、第9図は
搬送装置の要部の拡大平面図、第10図はプラズマ発生装
置の拡大截断側面図、第11図は第10図の右側面図、第12
図は真空処理室の拡大截断側面図である。 (1)……基板 (2)……真空処理室 (3)……加熱手段 (5)……プラズマ発生装置 (6)……反応性ガス導入管 (7)……真空ポンプ (8)……真空排気管 (9)……フォトレジスト膜 (11)……シャワープレート (12)(13)……室 (14)……大径の孔 (15)……小孔 (16)……温度計
FIG. 1 is a sectional view of a conventional plasma ashing apparatus, and FIG.
FIG. 3 is a diagram showing a distribution of ashing speed by the apparatus shown in FIG. 1, FIG. 3 is a sectional view of an embodiment of the apparatus of the present invention, and FIG. 4 is an enlarged sectional view of a substrate. 5 to 12 show a specific embodiment of the present invention. FIG. 5 is a side view of a part of the apparatus of the present invention, and FIG. 6 is a sectional view taken along the line VI-VI of FIG. 7 is a cutaway plan view taken along the line VII-VII of FIG. 5, FIG. 8 is a perspective view of the cassette case, FIG. 9 is an enlarged plan view of a main part of the transfer device, FIG. FIG. 10 is an enlarged cutaway side view of the plasma generator, FIG. 11 is a right side view of FIG.
The figure is an enlarged sectional side view of the vacuum processing chamber. (1) Substrate (2) Vacuum processing chamber (3) Heating means (5) Plasma generator (6) Reactive gas introduction pipe (7) Vacuum pump (8) Vacuum exhaust pipe (9) Photoresist film (11) Shower plate (12) (13) Room (14) Large hole (15) Small hole (16) Temperature Total

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】フォトレジスト膜を表面に塗布した基板を
設置した真空処理室内に、該基板を加熱する加熱手段を
設け、該真空処理室に、反応性ガスが流通し且つ途中に
該反応性ガスのプラズマを発生させるプラズマ発生装置
を備えた反応性ガス導入管と、真空ポンプに接続された
真空排気管とを接続し、該反応性ガス導入管から導入さ
れる電離された状態の反応性ガスを加熱された基板の表
面に沿って流し、該表面の該レジスト膜をアッシングす
るようにしたものに於て、該真空処理室内を該基板の表
面に沿って 設けた全面に小孔を有する多孔板からなるシャワープレ
ートで2室に区画し、該シャワープレートの該基板の表
面の中央部に対向する位置に大径の孔を形成し、該基板
が存する側に該真空排気管を接続し、もう一方の室に反
応性ガス導入管を接続したことを特徴とするプラズマア
ッシング装置。
1. A vacuum processing chamber in which a substrate having a photoresist film coated on its surface is installed, a heating means for heating the substrate is provided, and a reactive gas flows through the vacuum processing chamber and the reactive gas A reactive gas introduction pipe having a plasma generator for generating gas plasma is connected to a vacuum exhaust pipe connected to a vacuum pump, and ionized reactivity introduced from the reactive gas introduction pipe is connected to the reactive gas introduction pipe. A gas is made to flow along the surface of a heated substrate, and the resist film on the surface is ashed. The vacuum processing chamber has small holes all over the surface provided along the surface of the substrate. The shower plate made of a perforated plate is divided into two chambers, a large-diameter hole is formed at a position facing the center of the surface of the substrate of the shower plate, and the vacuum exhaust pipe is connected to the side where the substrate exists. And reactive gas in the other chamber A plasma ashing apparatus, wherein a plasma introduction pipe is connected.
【請求項2】前記真空処理室には前記シャワープレート
の大径の孔を通して基板の温度を測定する温度計を設け
ることを特徴とする特許請求の範囲第1項に記載のプラ
ズマアッシング装置。
2. A plasma ashing apparatus according to claim 1, wherein said vacuum processing chamber is provided with a thermometer for measuring a temperature of a substrate through a large-diameter hole of said shower plate.
JP1002045A 1989-01-10 1989-01-10 Plasma ashing device Expired - Lifetime JP2785028B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1002045A JP2785028B2 (en) 1989-01-10 1989-01-10 Plasma ashing device
US07/462,380 US5226056A (en) 1989-01-10 1990-01-09 Plasma ashing method and apparatus therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1002045A JP2785028B2 (en) 1989-01-10 1989-01-10 Plasma ashing device

Publications (2)

Publication Number Publication Date
JPH02183526A JPH02183526A (en) 1990-07-18
JP2785028B2 true JP2785028B2 (en) 1998-08-13

Family

ID=11518357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1002045A Expired - Lifetime JP2785028B2 (en) 1989-01-10 1989-01-10 Plasma ashing device

Country Status (1)

Country Link
JP (1) JP2785028B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2872637B2 (en) * 1995-07-10 1999-03-17 アプライド マテリアルズ インコーポレイテッド Microwave plasma based applicator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5911629A (en) * 1982-07-12 1984-01-21 Toshiba Corp Surface cleaning method
JPS6077427A (en) * 1983-10-04 1985-05-02 Seiko Epson Corp Dry etching device
JPS61117279A (en) * 1984-11-14 1986-06-04 Hitachi Ltd Substrate heater
JPS63124414A (en) * 1986-11-13 1988-05-27 Fujitsu Ltd Ashing apparatus

Also Published As

Publication number Publication date
JPH02183526A (en) 1990-07-18

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